# 2SC2859

**Changjing** · Bipolar (BJT) · SOT-23

2SC2859 from Changjing, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BASE | input | Base terminal of the 2SC2859 NPN transistor; the datasheet rates emitter-base voltage VEBO at 5 V and collector current IC at 500 mA maximum. |
| 2 | EMITTER | passive | Emitter terminal of the 2SC2859 NPN transistor; emitter-base breakdown voltage V(BR)EBO is specified at 5 V minimum. |
| 3 | COLLECTOR | passive | Collector terminal of the 2SC2859 NPN transistor; the datasheet limits collector-base voltage VCBO to 35 V and collector-emitter voltage VCEO to 30 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Collector-Base Voltage | VCBO |  |  | 35 | V | Ta=25℃ | 1 |
| Collector-Emitter Voltage | VCEO |  |  | 30 | V | Ta=25℃ | 1 |
| Emitter-Base Voltage | VEBO |  |  | 5 | V | Ta=25℃ | 1 |
| Collector Current | IC |  |  | 500 | mA | Ta=25℃ | 1 |
| Collector Power Dissipation | PC |  |  | 150 | mW | Ta=25℃ | 1 |
| Operation Junction and Storage Temperature Range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Collector-base breakdown voltage | V(BR)CBO | 35 |  |  | V | IC=100µA, IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | 30 |  |  | V | IC=1mA, IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | 5 |  |  | V | IE=100µA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | 0.1 | µA | VCB=35V, IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | 0.1 | µA | VEB=5V, IC=0 | 1 |
| DC current gain hFE(1) | hFE(1) | 70 |  | 400 |  | VCE=1V, IC=100mA | 1 |
| DC current gain hFE(2) | hFE(2) | 25 |  |  |  | VCE=6V, IC=400mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.25 | V | IC=100mA, IB=10mA | 1 |
| Base-emitter voltage | VBE |  |  | 1 | V | VCE=1V,IC=100mA | 1 |
| Transition frequency | fT | 300 |  |  | MHz | VCE=6V,IC=20mA | 1 |
| Collector output capacitance | Cob |  |  | 7 | pF | VCB=6V, IE=0, f=1MHz | 1 |
| Thermal Resistance From Junction To Ambient | RΘJA |  | 833 |  | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `2SC2859`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `2sc2859-etched.step` / `2sc2859-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sc2859.step` / `2sc2859.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590920576876310528) (4 pp, sha256 `042959d20c348d48`, retrieved 2026-10-17, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/2sc2859-datasheet.pdf)